Except, it's very obvious in the Angel of Hyperdeath segment of Asriel's battle that, while their DT may have been comparable for a time, if Frisk hadn't caused the souls that Asriel held to fight back like they did with Flowey, via SAVE, they were on a downward slope and would have eventually lost. ("I can feel it... Every time you die, your grip on this world slips away. Every time you die, your friends forget you a little more. Your life will end here, in a world where no one remembers you...")
Heck, Frisk proved that he can't take on either Omega Flowey or Asriel head-on. Instead, they sabotaged him from the inside both times utilizing SAVE. Plus, Omega Flowey purposefully entrapped Frisk in a loop with the intention of "playing" with them forever, which only stopped when the human SOULs rebelled against him.
It's pretty clear that Omega Flowey > Base Asriel > Angel of Hyperdeath Asriel, as Frisk can at least damage Flowey without outside assistance, whereas they can't even harm Asriel, and are completely immobilized by the time Asriel goes all out on them. I can see Frisk possibly being stronger than Omega Flowey, but Full Power Asriel is definitely far superior to Pacifist Frisk. And any relation between how powerful Full Power Asriel is to Genocide Frisk is never, at any point, made clear.